Also one of my own made video's, save it to your pc with a programme called ''Save2Pc'' or whatever programme you use and load it in sony vegas or Gspot (the codec programme) and check it out, cause i can't seem to figure it out

Ok. An avi is really just a wrapper. Different avi files may still use different codes. Search for and download GSpot, open a few clips in it and look at the codec info. I bet the clip that's showing black is a different codec.

Also one of my own made video's, save it to your pc with a programme called ''Save2Pc'' or whatever programme you use and load it in sony vegas or Gspot (the codec programme) and check it out, cause i can't seem to figure it out.

Yes you do. But I was referring to your SOURCE videos. Your comment ALL video's [sic] were .AVI files. suggested to me you had a number of different source files. If the source was one file only then I'm barking up the wrong tree.